I'm new to this particular board but have an unfortunate amount of experience with injection related infections (bummer, huh?).
The fact is, nobody can really tell you whether this is an infection or an inflammatory response. It could be either. To be safe, you really ought to get into the doc, who will likely start you on antibiotics. Continuing to take gear while taking antibiotics is not a big thing (I just did it).
Odds are, you'll be fine just waiting but you never know. Certainly, it is best not to take chances because if it is an infection, it won't get more fun over time.